66117544 has 16 divisors (see below), whose sum is σ = 127969920. Its totient is φ = 31992240.

The previous prime is 66117533. The next prime is 66117559. The reversal of 66117544 is 44571166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133054 + ... + 133549.

It is an arithmetic number, because the mean of its divisors is an integer number (7998120).

Almost surely, 2^66117544 is an apocalyptic number.

It is an amenable number.

66117544 is a deficient number, since it is larger than the sum of its proper divisors (61852376).

66117544 is a wasteful number, since it uses less digits than its factorization.

66117544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266640 (or 266636 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 66117544 is about 8131.2695195769. The cubic root of 66117544 is about 404.3637706455.

The spelling of 66117544 in words is "sixty-six million, one hundred seventeen thousand, five hundred forty-four".